'To be 19 years old and creating that panic at a World Cup is huge.
De Bruyne profited from spaces opening up in the middle as Brazil's centre backs were forced to deal with the threat out wide, and he scored his first goal of the tournament in the 2-1 victory.
"Belgium didn't arrive here by chance. 20 players have started at least one game and they have all contributed", he explained.
Martinez's change was a forced one, with right wing-back Thomas Meunier suspended and could prompt a change in formation.
'They had to answer different questions tonight and I thought they answered them very well'.
"What we didn't have was an global who has the knowledge of winning a World Cup, of being a footballer expected to perform in the eyes of the world and how it feels".
"Kevin De Bruyne is a modern playmaker in the fact that he goes even quicker than what you can see".
Roberto Martinez said on Monday the team's concentration would be key in Belgium's semi-final encounter with France and that the tactical adventure he used against Brazil in the quarter-finals was no guarantee to secure a win.
"In our set-up he had to be a playmaker, someone who would play a lot deeper, someone who would help getting the ball forward and bring other players into the play. That was a precautionary measure", the coach added.
They last met in a friendly in 2015 and a number of Belgian and French players are team mates at club level.
While the duo of Mbappe and Pogba are attracted by their expansive, aggressive play, Lukaku is in the picture for his power play.Today's semi duel is expected to live up to its a worthy its billing.